It is a GOOD segregation though as it is not based on race or gender or economic circumstances - it is purely ideological! If ideological segregations were made in real life by say having each state and it’s residents align with an ideology then those with unworkable ideologies would quickly fail and be identified as something to be eliminated - hence the liberal whining.
People regard ideological self-segregation as legitimate so they don't bother acknowledging it, but other forms of segregation occur that people don't notice or want to admit.
If ideological segregations were made in real life by say having each state and it’s residents align with an ideology then those with unworkable ideologies would quickly fail and be identified as something to be eliminated
Or we get states so internally homogenous and so violently opposed to other states that the result is civil war. There's much to be said for the unideological people who aren't so intent on combat with people who think differently from themselves.
... hence the liberal whining.
Well, yes, she's making a liberal complaint, but is it really so different from the conservative complaint that we don't know our neighbors anymore, interact with them, or have much in common with them?
People are always going to self-segregate into groups of similar people. That can't be prevented, and there's something a little totalitarian about suggesting that it should.
Still, it's a noteworthy development that technologies designed to "bring people closer together" only succeed in putting different kinds of people further apart. Probably that was inevitable, but it could be troubling, given how hard it is to keep countries from tearing themselves apart.